Engraving-machine attachment.



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ARCHIE A. MACCALLUM, OF MAGOG, CANADA.

ENGRAVING-IVIACHINE ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 635,895, dated October31, 1899. I Application filed May 4, 1899. Serial No. 715,597. (Nomodel.)

T0 @ZZ whom it" may concern:-

Be it known that I, ARCHIEA. MACCALLUM, a subject of the Queen of GreatBritain, residing at Magog, in the Province of Quebec and Dominion ofCanada, have invented certain new and useful Improvements in Attachmentsfor Pantograph Engraving-Machines; and I do declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

My invention relates to an attachment for pantograph engraving-machines,and more particularly to that class in which the pattern or design isduplicated on the copper printingcylinder by a series of diamond pointsfixed in the free ends of a corresponding series of individuallever-arms simultaneously operated by a treadle and which is generallyknown to the trade as the Hope pantograph engraving-machine 5 and theobject is to improve the construction and increase the efficiency of themachine.

To this end the invention consists in certain features of constructionand combination of parts, which will be hereinafter more fully describedand claimed.

In the accompanying drawings, the same reference characters indicate thesame parts of the invention.

Figure l is a perspective View of the upper part of a pantographengraving-machine with Fig. 2 is' my improvement attached thereto. adetail view of the attachment removed from the machine.

l denotes a copper cylinder upon which the designs are traced by thediamonds 2 2, fixed in the free ends of the levers 3 3, fulcrumed on thebar 4, and 5 denotes the curved bar which extends across the path of therear ends of the levers and which is connected to the treadle by a rod6, so that .when the treadle is pressed down the diamond points will bebrought into contact with the cylinder, and when the treadle is releasedthe points will be raised clear of the cylinder.

Provision is made for rotating the cylinder forward and backward andalso for moving the bar 4 longitudinally, thereby moving the diamondpoints laterally to produce the proper design on the cylinder.

Heretofore the end levers 3 3 when moved beyond the end of the cylinderwould drop below the face of the cylinder and in moving back again wouldcome in contact with the end of the cylinder and be broken off or bentout of true, and in order to overcome this ob` jection I have providedthe shoe 7, which is adj ustably secured to the curved bar 5, so as toproject across the rear ends of the levers 3' 3 and support them whentheir points have been moved beyond the ends of the cylinder.

The accompanying drawings show my in vention in the best form now knownto me; but many changes in the details might be made within the skill ofa good mechanic without departing from the spirit of my invention assetforth in the claim at the end of this specification.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent of the-United States, is-

In a machine of the class described, the combination with the endlevers, of the curved bar 5 and the shoes 7 7 mounted on said bar andprojecting into the path of the rear ends of said levers, substantiallyas and for the purpose set forth.

In testimony whereof I'have hereunto set my hand in presence of twosubscribing witnesses.

ARCHIE A. MACCALLUM.

Witnesses WILLIAM KINCAID, WM. MACCALLUM.

